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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.springframework.security.crypto.bcrypt</a></div>
<h2 title="Class BCrypt" class="title">Class BCrypt</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>org.springframework.security.crypto.bcrypt.BCrypt</li>
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<pre>public class <span class="typeNameLabel">BCrypt</span>
extends java.lang.Object</pre>
<div class="block">BCrypt implements OpenBSD-style Blowfish password hashing using the scheme described in
"A Future-Adaptable Password Scheme" by Niels Provos and David Mazieres.
<p>
This password hashing system tries to thwart off-line password cracking using a
computationally-intensive hashing algorithm, based on Bruce Schneier's Blowfish cipher.
The work factor of the algorithm is parameterised, so it can be increased as computers
get faster.
<p>
Usage is really simple. To hash a password for the first time, call the hashpw method
with a random salt, like this:
<p>
<code>
String pw_hash = BCrypt.hashpw(plain_password, BCrypt.gensalt()); <br />
</code>
<p>
To check whether a plaintext password matches one that has been hashed previously, use
the checkpw method:
<p>
<code>
if (BCrypt.checkpw(candidate_password, stored_hash))<br />
&nbsp;&nbsp;&nbsp;&nbsp;System.out.println("It matches");<br />
else<br />
&nbsp;&nbsp;&nbsp;&nbsp;System.out.println("It does not match");<br />
</code>
<p>
The gensalt() method takes an optional parameter (log_rounds) that determines the
computational complexity of the hashing:
<p>
<code>
String strong_salt = BCrypt.gensalt(10)<br />
String stronger_salt = BCrypt.gensalt(12)<br />
</code>
<p>
The amount of work increases exponentially (2**log_rounds), so each increment is twice
as much work. The default log_rounds is 10, and the valid range is 4 to 31.</div>
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<th class="colFirst" scope="col">Constructor</th>
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<td class="colFirst"><code>static boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#checkpw(byte%5B%5D,java.lang.String)">checkpw</a></span>&#8203;(byte[]&nbsp;passwordb,
java.lang.String&nbsp;hashed)</code></th>
<td class="colLast">
<div class="block">Check that a password (as a byte array) matches a previously hashed one</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#checkpw(java.lang.String,java.lang.String)">checkpw</a></span>&#8203;(java.lang.String&nbsp;plaintext,
java.lang.String&nbsp;hashed)</code></th>
<td class="colLast">
<div class="block">Check that a plaintext password matches a previously hashed one</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#gensalt()">gensalt</a></span>()</code></th>
<td class="colLast">
<div class="block">Generate a salt for use with the BCrypt.hashpw() method, selecting a reasonable
default for the number of hashing rounds to apply</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#gensalt(int)">gensalt</a></span>&#8203;(int&nbsp;log_rounds)</code></th>
<td class="colLast">
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#gensalt(int,java.security.SecureRandom)">gensalt</a></span>&#8203;(int&nbsp;log_rounds,
java.security.SecureRandom&nbsp;random)</code></th>
<td class="colLast">
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#gensalt(java.lang.String)">gensalt</a></span>&#8203;(java.lang.String&nbsp;prefix)</code></th>
<td class="colLast">&nbsp;</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#gensalt(java.lang.String,int)">gensalt</a></span>&#8203;(java.lang.String&nbsp;prefix,
int&nbsp;log_rounds)</code></th>
<td class="colLast">
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#gensalt(java.lang.String,int,java.security.SecureRandom)">gensalt</a></span>&#8203;(java.lang.String&nbsp;prefix,
int&nbsp;log_rounds,
java.security.SecureRandom&nbsp;random)</code></th>
<td class="colLast">
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#hashpw(byte%5B%5D,java.lang.String)">hashpw</a></span>&#8203;(byte[]&nbsp;passwordb,
java.lang.String&nbsp;salt)</code></th>
<td class="colLast">
<div class="block">Hash a password using the OpenBSD bcrypt scheme</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BCrypt.html#hashpw(java.lang.String,java.lang.String)">hashpw</a></span>&#8203;(java.lang.String&nbsp;password,
java.lang.String&nbsp;salt)</code></th>
<td class="colLast">
<div class="block">Hash a password using the OpenBSD bcrypt scheme</div>
</td>
</tr>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public&nbsp;BCrypt()</pre>
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<a id="hashpw(java.lang.String,java.lang.String)">

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<h4>hashpw</h4>
<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;hashpw&#8203;(java.lang.String&nbsp;password,
                                      java.lang.String&nbsp;salt)</pre>
<div class="block">Hash a password using the OpenBSD bcrypt scheme</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>password</code> - the password to hash</dd>
<dd><code>salt</code> - the salt to hash with (perhaps generated using BCrypt.gensalt)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the hashed password</dd>
</dl>
</li>
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<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;hashpw&#8203;(byte[]&nbsp;passwordb,
                                      java.lang.String&nbsp;salt)</pre>
<div class="block">Hash a password using the OpenBSD bcrypt scheme</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>passwordb</code> - the password to hash, as a byte array</dd>
<dd><code>salt</code> - the salt to hash with (perhaps generated using BCrypt.gensalt)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the hashed password</dd>
</dl>
</li>
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<h4>gensalt</h4>
<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;gensalt&#8203;(java.lang.String&nbsp;prefix,
                                       int&nbsp;log_rounds,
                                       java.security.SecureRandom&nbsp;random)
                                throws java.lang.IllegalArgumentException</pre>
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prefix</code> - the prefix value (default $2a)</dd>
<dd><code>log_rounds</code> - the log2 of the number of rounds of hashing to apply - the work
factor therefore increases as 2**log_rounds.</dd>
<dd><code>random</code> - an instance of SecureRandom to use</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an encoded salt value</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if prefix or log_rounds is invalid</dd>
</dl>
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<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;gensalt&#8203;(java.lang.String&nbsp;prefix,
                                       int&nbsp;log_rounds)
                                throws java.lang.IllegalArgumentException</pre>
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>prefix</code> - the prefix value (default $2a)</dd>
<dd><code>log_rounds</code> - the log2 of the number of rounds of hashing to apply - the work
factor therefore increases as 2**log_rounds.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an encoded salt value</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if prefix or log_rounds is invalid</dd>
</dl>
</li>
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<h4>gensalt</h4>
<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;gensalt&#8203;(int&nbsp;log_rounds,
                                       java.security.SecureRandom&nbsp;random)
                                throws java.lang.IllegalArgumentException</pre>
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>log_rounds</code> - the log2 of the number of rounds of hashing to apply - the work
factor therefore increases as 2**log_rounds.</dd>
<dd><code>random</code> - an instance of SecureRandom to use</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an encoded salt value</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if log_rounds is invalid</dd>
</dl>
</li>
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<h4>gensalt</h4>
<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;gensalt&#8203;(int&nbsp;log_rounds)
                                throws java.lang.IllegalArgumentException</pre>
<div class="block">Generate a salt for use with the BCrypt.hashpw() method</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>log_rounds</code> - the log2 of the number of rounds of hashing to apply - the work
factor therefore increases as 2**log_rounds.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an encoded salt value</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if log_rounds is invalid</dd>
</dl>
</li>
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<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;gensalt&#8203;(java.lang.String&nbsp;prefix)</pre>
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<pre class="methodSignature">public static&nbsp;java.lang.String&nbsp;gensalt()</pre>
<div class="block">Generate a salt for use with the BCrypt.hashpw() method, selecting a reasonable
default for the number of hashing rounds to apply</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an encoded salt value</dd>
</dl>
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<pre class="methodSignature">public static&nbsp;boolean&nbsp;checkpw&#8203;(java.lang.String&nbsp;plaintext,
                              java.lang.String&nbsp;hashed)</pre>
<div class="block">Check that a plaintext password matches a previously hashed one</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>plaintext</code> - the plaintext password to verify</dd>
<dd><code>hashed</code> - the previously-hashed password</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the passwords match, false otherwise</dd>
</dl>
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<pre class="methodSignature">public static&nbsp;boolean&nbsp;checkpw&#8203;(byte[]&nbsp;passwordb,
                              java.lang.String&nbsp;hashed)</pre>
<div class="block">Check that a password (as a byte array) matches a previously hashed one</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>passwordb</code> - the password to verify, as a byte array</dd>
<dd><code>hashed</code> - the previously-hashed password</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the passwords match, false otherwise</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>5.3</dd>
</dl>
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